The 5KP15A device is designed specifically to protect sensitive electronic
equipment from voltage transients induced by lightning and other transient
voltage events. Its job it is to short the supply of the transient to ground in
a picosecond (1E-12 seconds).
Failure of this part in the open mode would have no effect on radio operation.
If shorted, it would pop the main fuse, but only if the relay K1 were on. Since
you do not hear that relay clicking on, the transient suppressor is not even in
the circuit.
If D116 were shorted, it would put Q77 base high, pulling Q23 base low. This
would override the Power Switch turn on signal at J8 on the I/O board and this
would prevent the power switch from turning the radio on.
Gary
W0DVN
> On Jan 18, 2020, at 9:14 PM, Bernie Skoch via TenTec <tentec@contesting.com>
> wrote:
>
> 5KP15A
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